LF347N

Overview

The LF347N is a quad general-purpose JFET-input operational amplifier manufactured by Texas Instruments. It features four independent amplifiers in a single package, offering high-speed performance with a gain-bandwidth product of 3 MHz and a slew rate of 13 V/us. The device operates on supply voltages ranging from 7 V to 36 V (single) or ±3.5 V to ±18 V (dual). Key electrical specifications include an input bias current of 200 pA, an input offset voltage of 10 mV, and a common-mode rejection ratio of 100 dB. It is housed in a 14-pin PDIP package.

Feature Summary

• Integrates four high-speed JFET-input operational amplifiers within a single low-cost monolithic IC.
• Provides very low input bias and offset currents due to matched high-voltage JFET input stages.
• Maintains large gain-bandwidth product and fast slew rates while requiring low power supply current.

Applications

• High-speed integrators
• Digital-to-analog converters
• Sample-and-hold circuits

Procurement Notes

Verify the specific manufacturer marking and date code against official Texas Instruments documentation to confirm authenticity. Ensure the component matches the 14-pin PDIP physical form factor and that the electrical parameters align with the standard LF347N datasheet specifications before integration into production designs.

Selection Notes

Select this component when designing circuits requiring multiple operational amplifiers with JFET inputs for low bias current characteristics. It is suitable for applications needing moderate bandwidth and high slew rates without the complexity of discrete solutions. Consider the PDIP-14 package constraints for through-hole mounting requirements.

Part Context

The LF347N belongs to the LF347 family of wide-bandwidth quad JFET-input operational amplifiers. This series is designed to provide cost-effective solutions for multi-channel analog signal processing. The 'N' suffix typically denotes the plastic dual in-line package variant, distinguishing it from surface-mount options like the SOIC package found in other family members.

Replacement Considerations

The TL084CN is a documented alternative within the same operational amplifier category. Verify pin compatibility and ensure that the replacement's electrical parameters, such as input bias current and slew rate, meet the specific circuit requirements.